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There are a few sound cards out there that have real time encoding built in, called Dolby Live.
And if your soundcard doesn't "support" Dolby Live, you can use the freeware application DolbyOutDS to add realtime DD encoding to any soundcard with digital out.
But per Felix post for a musical system i'd avoid such compression. And if you;re running a DVD playback then realtime decoding then encoding isn't necessary unless you want the PC to controll volume.